[ausev] wireless charging

[Steve Ross]

If the resonant frequency transfer was a wide field of energy, than anything
with a resonant receiver would be able to tap into the energy contained in
the filed.  Would this allow you to charge a fleet of cars in the same
garage with one resonant generator?  Since it is generating a constant field
of energy, would the generator be 'on' the entire time holding an energy
field open?  What type of energy would the generator require to hold the
field open?  Would this field be the same as an MRI machine in the hospital?
Can magnetism really be that tightly 'tuned' so it does not affect anything
else?

This could be a great way to charge up EV's just by parking them in the
garage and turning the field on.  It could also charge onboard electronics
like phones and IPods left in the car.  Wow, what a concept, too kewl.

Steve Ross

-----Original Message-----
From: tomsmail at wtez.net [mailto:tomsmail at wtez.net] 
Sent: Wednesday, January 21, 2009 2:17 PM
To: AustinEV News Announcements and General Discussion
Cc: ausev at austinev.org
Subject: Re: [ausev] wireless charging

Who will volunteer to be the first person with a pacemaker (or laptop) to
walk thru one of these B fields? ;-)

Tom


--- mkohler at austin.rr.com wrote:

From: "Marc Kohler" <mkohler at austin.rr.com>
To: "'AustinEV News Announcements and General Discussion'"
<ausev at austinev.org>
Subject: Re: [ausev] wireless charging
Date: Wed, 21 Jan 2009 08:19:14 -0600

Gil, that's why I mentioned the magnetic resonance version.
It travels much farther than inductance and can only be "felt" when you have
a matching receiver tuned to that resonant frequency.
Marc

-----Original Message-----
From: ausev-bounces at austinev.org [mailto:ausev-bounces at austinev.org] On
Behalf Of Gil Dawson
Sent: Tuesday, January 20, 2009 6:31 PM
To: AustinEV News Announcements and General Discussion
Subject: Re: [ausev] wireless charging

> It looks like a mouse pad and can send power through the air, over  
> a distance of up to a few inches. A powered coil inside that pad  
> creates a magnetic field, which as Faraday predicted, induces  
> current to flow through a small secondary coil that's built into  
> any portable device, such as a flashlight, a phone, or a  
> BlackBerry. The electrical current that then flows in that  
> secondary coil charges the device's onboard rechargeable battery.  
> (That iPhone in your pocket has yet to be outfitted with this tiny  
> coil, but, as we'll see, a number of companies are about to  
> introduce products that are.)

> We were able to transfer 60 watts with ~40% efficiency over  
> distances in excess of 2 meters.

GM's EV1 and S-10E, and  and Toyota's Rav4EVs all used Inductive  
Coupling to transfer up to 6 kw for charging.  The paddle is held  by  
a slot and springs rather closely to the coils, but there's still  
perhaps 1/4 inch of play, so it is over some bit of distance.

Getting this technology to work over room-sized distances may be  
feasible soon, even within an acceptable efficiency.  But can you  
imagine what it will take to get OSHA to approve people in  the  
workplace walking through a power transfer field?

--Gil
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